Wei Zi learned the identity of the May 4th Movement.

Li Hong, the fourth elder brother, appeared in the thirteenth episode, when Zhen Xuan went to Yuanmingyuan for the first time to spend the summer. The birth mother of the May 4th Movement was a humble handmaid, and her early death was a secret of the harem. In order to take Zhen Xuan back to the palace from Kanluoji, the emperor gave Zhen Xuan Manchu the name Niulu, and arranged to be Li Hong's biological mother in May, so she called Zhen Xuan Ernian in May.